Moonsound v1 issue

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By Sylvester

Hero (518)

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10-04-2021, 19:04

Check page 14 of Clubblad MSX Vriendenclub Mariënberg (Dutch): https://docplayer.nl/15037693-Clubblad-msx-vriendenclub-mari...
It explains the upgrade of v1 and v2, maybe it helps.

By SjaaQ

Master (203)

SjaaQ's picture

10-04-2021, 19:22

The jumpers a "set" by the orginal routing on the prints backside:
J1 2-3 NOEMU
J2 2-3 128K
J3 1-2 128K
J4 1-2 128K

I am going to cut all those connections and install jumpers so I can play around with them.

I find it strange there is no information about expanding either of the original Moonsound cartridges. They have been around for some time and there must be some people that have expanded them (or have expanded versions).

Edit: Nice find, Sylvester!

By SjaaQ

Master (203)

SjaaQ's picture

10-04-2021, 19:33

Can anybody take a picture of the article of Sunrise in XSW-Magazine januari/februari 1998? The Clubblad MSX Vriendenclub Mariënberg only specifies a 640K upgrade, not the replacement of the RAM.

By Angelo Sanna

Rookie (29)

Angelo Sanna's picture

13-04-2021, 00:28

SjaaQ wrote:

Can anybody take a picture of the article of Sunrise in XSW-Magazine januari/februari 1998? The Clubblad MSX Vriendenclub Mariënberg only specifies a 640K upgrade, not the replacement of the RAM.

But you can try to follow the conversion as described in the "MSX Vriendenclub Mariënberg" magazine, because it also describes the build to 1024K (not only 640K). But then you only follow the steps for conversion to 512K. See page 15.

So:
- Ignore the steps for adding the second SRAM. ("soldeer hierna de tweede sram","soldeer draad tussen de tweede SRAM" blabla).
- Remove the wire on the bottom of the print between pin 30 and 32.
- Solder a wire between pin 30 from your 512K SRAM to pin 34 of the YRW801.

By SjaaQ

Master (203)

SjaaQ's picture

19-04-2021, 11:23

I have tried every combination of a 128K chip and the 512K chip in the moonsound v2, together with any combination of the jumpers J2,J3 and J4. Can't get 640K to work.

Removed the 128K chip, replaced it with 512K and set all jumpers to 512K. Moonblaster detects 512K, tried playing 512K mods with NMP, whichs works perfectly.

I have now put in two 512K chips and set the jumpers to 512K. Moonblaster detects 1024M, tried playing (almost) 1024K mods with NMP, which also works.

Conclusion: There is no dip switch setting that enables 640K.

By Meits

Scribe (6350)

Meits's picture

19-04-2021, 11:51

Iirc I had 640KB in my Moonsound v2. Some of the pins of the extra sram chip were (intentionally?) left out of the socket.
Now there's 1MB in it and both 512K chips are fully seated in their sockets.

By SjaaQ

Master (203)

SjaaQ's picture

19-04-2021, 13:01

I think the PDF referred to that, you are right (and you need to solder that pin 30 to 32). I am not going to try that though. I only was messing with the v2 to check the RAM before I place it in the v1.

By Angelo Sanna

Rookie (29)

Angelo Sanna's picture

20-04-2021, 17:54

SjaaQ wrote:

I think the PDF referred to that, you are right (and you need to solder that pin 30 to 32). I am not going to try that though. I only was messing with the v2 to check the RAM before I place it in the v1.

But your goal is to get the SRAM working on the Moonsound v1?

By SjaaQ

Master (203)

SjaaQ's picture

21-04-2021, 08:20

Angelo Sanna wrote:
SjaaQ wrote:

I think the PDF referred to that, you are right (and you need to solder that pin 30 to 32). I am not going to try that though. I only was messing with the v2 to check the RAM before I place it in the v1.

But your goal is to get the SRAM working on the Moonsound v1?

Correct. Just 512K though. I have to wait for the new DAC to arrive, but at least I am able to confirm the RAM chips I have left are working.

By raymond

Champion (505)

raymond's picture

21-04-2021, 11:43

SjaaQ wrote:

Can anybody take a picture of the article of Sunrise in XSW-Magazine januari/februari 1998? The Clubblad MSX Vriendenclub Mariënberg only specifies a 640K upgrade, not the replacement of the RAM.

Which article do you mean exactly? As I cannot find the article you mean in that issue.

Found it in issue 21 May/June 1998. I will send you a scan of it.

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